‍Excel

The Euler Method: (pronounced "oiler") See Dr. Culbertson's Youtube videos on how to build this spreadsheet step-by-step. The total time for this tutorial is nearly 40 minutes, which might sound like a lot, until a rookie tries to do it all by their onesie.
Part 1
Part 2
Part 3
Part 4
Part 5
Part 6
(Insert someone's working projectile program here) And here is a finished Euler spreadsheet. Usually in high school physics, we don't take air resistance into account when analyzing projectile motion. However, using the Euler method, you can show how air resistance can have an affect.
This spreadsheet allowed us to take a closer look at ionization energies of the first few elements.
Here, we used the Morse potential to compare ionization energy and the interatomic separation.
Here, we modeled a standing wave and animated it using the calculate setting in Microsoft Excel.
Here is the plot of ionization energies. It is on Sheet 2.

Here, is a spread sheet that simulates the radioactive decay of 4 different substances, each with a different half life. It is an example of another way you can use circular references in excel.
Here is a chart of atomic radii.